It's a bit unclear to me whether you are interested in finding genes that are specifically expressed in T cells relative to other tissues and cell types, or whether you are looking for data sets that explore many different conditions and perturbations specifically in T cells.

Actually ...even I am not sure which way I should be going...just trying to think of all the possibilities. The thing is....I have some gene specific information and these experiments have been done on T cells. Now I am thinking of creating networks based on expression data of those genes...

Because there is no universally accepted threshold for "expressed in a sample", we don't provide such lists. However, we do provide the entire data matrix for download (on the "Downloads" page), and from there it's reasonably simple to define your filters in your favorite tool (Excel, R, etc.).

I was looking at BioGPS to download tissue specific data, I can see tissue expression per gene - not sure where I can find the all genes from specific cell or tissue. For example this link gives the expression profile of TNF in different Tissue (http://plugins.gnf.org/cgi-bin/getRawData.cgi?gene=7124&dataset=1) How can I download all genes expressing in a particular tissue from BioGPS ?

"Blood is a complex tissue comprising numerous cell types with distinct functions and corresponding gene expression profiles. We attempted to define the cell type specific gene expression patterns for the major constituent cells of blood, including B-cells, CD4+ T-cells, CD8+ T-cells, lymphocytes and granulocytes. We did this by comparing the global gene expression profiles of purified B-cells, CD4+ T-cells, CD8+ T-cells, granulocytes, and lymphocytes using cDNA microarrays."

The supplementary materials have the gene 'signatures' for the cell types. I'm sure there's other studies of this type, you might also want to crawl GEO and ArrayExpress for relevant microarray experiments and look at the associated publications.

Genevestigator is an online tool that allows you to find which genes are expressed in T cells and not in other tissue types. The tool for this is called Anatomy within the Biomarker Search section of the applications. Genevestigator is freely accessible, and after registration you have full access to all tools for seven days. After that, you will continue to have free access to the basic tools (but this does not include the biomarker search tools). If you need any help, please contact me (phz@nebion.com).

You may also check HPRD, download the raw data files and parse the proteins based on tissue expression. For example see the interleukin 8 at HPRD. You can also get the literature curated interacting partners of IL8 from HPRD.

BLUEPRINT will focus on distinct types of haematopoietic cells from healthy individuals and on their malignant leukaemic counterparts. It aims to generate at least 100 reference epigenomes and study them to advance and exploit knowledge of the underlying biological processes and mechanisms in health and disease.